Stereoisomerism

Which of the following conformations will be the most stable?

Optical activity of an enantiomeric mixture is $+12.6°$ and the specific rotation of $\left(+\right)$ isomer is $+30°$. The optical purity is____$\%$

Total number of isomers (including stereoisomers) obtain on monochlorination of methylcyclohexane is

Observe structures of the following compounds

The total number of structures/compounds which possess asymmetric carbon atoms is

Total number of possible stereoisomers of dimethyl cyclopentane is

Among the following structures, which will show the most stable enamine formation?

(Where $\mathrm{Me}$ is $-{\mathrm{CH}}_3$)

In the following structures, which one is having staggered conformation with maximum dihedral angle?

The number of stereoisomers possible for $1,2$ -dimethyl cyclopropane is:

The number of acyclic structural isomers (including geometrical isomers) for pentene are $\underline{ }$

Which of the following molecules does not show stereo isomerism ?

Staggered and eclipsed conformers of ethane are:

Which of the following compounds shows geometrical isomerism? 

Among the following compounds, geometrical isomerism is exhibited by :

The number of chiral centres present in threonine is _________

Which of the following compounds produces an optically inactive compound on hydrogenation? 

Among $\left(a\right)-\left(d\right),$ the complexes that can show geometrical isomerism are:
$\left(a\right)$ ${\left[Pt{\left(N{H}_3\right)}_{3}Cl\right]}^{+}$
$\left(b\right)$ ${\left[Pt\left(N{H}_3\right)C{l}_5\right]}^{-}$
$\left(c\right)$ $\left[Pt{\left(N{H}_3\right)}_{2}Cl\left(N{O}_2\right)\right]$
$\left(d\right)$ ${\left[Pt{\left(N{H}_3\right)}_{4}ClBr\right]}^{2+}$

The number of chiral carbon centres in penicillin is _________.

In the following structure, the double bonds are marked as $\mathrm{I},\hspace{0.17em}\mathrm{II}, \mathrm{III}$ and $\mathrm{IV}$. 



 Geometrical isomerism is not possible at the site(s):

The absolute configuration of

is:

The optically inactive compound from the following is: